TNG Near-IR Photometry of five Galactic Globular Clusters

Details TNG Near-IR Photometry of five Galactic Globular Clusters TNG Near-IR Photometry of five Galactic Globular Clusters

2004-01-09

arxiv.org/abs/astro-ph/0401153v2

Astronomy and Astrophysics

Astrophysics

10 pages, 12 figures, accepted by Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20034402

We present near--infrared J and K observations of giant stars in five metal-poor Galactic Globular Clusters (namely M3, M5, M10, M13 and M92) obtained at the Telescopio Nazionale Galileo (TNG). This database has been used to determine the main photometric properties of the red giant branch (RGB) from the (K,J-K) and, once combined with the optical data, in the (K,V-K) Color Magnitude Diagrams. A set of photometric indices (the RGB colors at fixed magnitudes) and the major RGB evolutionary features (slope, bump, tip) have been measured. The results have been compared with the relations obtained by Ferraro et al. 2000 and with the theoretical expectations, showing a very good agreement.

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